The U.S. military said Iran fired missiles at Kuwait, which fell apart en route, and downed drones targeting American forces.
Iran and the United States have reached an impasse again over how to end their war. Their ceasefire is growing increasingly shaky.
Iran has offered to end its chokehold on the Strait of Hormuz without addressing its nuclear program.
The crews of all three merchant vessels seized by the U.S. military over the past week are still in U.S. custody.
In a social media post Thursday morning, he said the military is intensifying its mine clearing efforts in the critical waterway.
Iran has fired on three ships in the Strait of Hormuz and seized two of them.
Lebanon and Israel held their first direct diplomatic talks in decades on Tuesday in Washington after more than a month of war.
President Trump says China has agreed not to provide weapons to Iran as reports circulate that Beijing has considered transferring arms.
President Trump said Monday they had been contacted by the other side and they want to work a deal.
Negotiators from Iran and the U.S. are preparing for high-level talks amid a shaky ceasefire.